Надо сделать предложения попозитивнее 1.Sorry, I have no idea about it, as it’s not my responsibility.
2.I’m sorry to have kept you waiting.
3.We can only supply the goods after receipt of your payment.
4.I’m sorry I didn’t respond to you in time. I was too busy.
5.Your letter is not clear at all. I can’t understand it.

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I can point you in the right direction for that, as it falls outside of my area of responsibility.

Thank you for your patience.

Once we receive your payment, we will promptly send out your order.

I apologize for the delay in getting back to you. I appreciate your understanding.

Could you please provide additional clarification on your letter? Thank you.